I/O possible - what does this error message mean?

[Herb Barad]

On one of our A/UX machines, I get a weird message:

I/O possible

and then my terminal is screwed up.  I have to type

	reset^J

(note the ^J instead of hitting return since it doesn't recognize ^M as and
end of line until it is reset).

How can I stop this?  Why does it happen?

-- 
Herb Barad	[Signal & Image Processing Laboratory]
		[Electrical Engineering Dept. - Tulane Univ.]
INTERNET:	barad at bourbon.ee.tulane.edu
USENET:		barad at bourbon.uucp